A high density and low residual stress parts additive manufacturing equipment and method

Abstract

The invention discloses a high-density low-residual-stress part additive manufacturing device and method. The device comprises a composite nozzle arranged above a workbench, the composite nozzle is installed on a movement mechanism, a heat spray energy inlet of the composite nozzle is connected with a heat spray system through a heat spray inlet gate valve, a cold spray gas inlet of the compositenozzle is connected with a cold spray system through a cold spray inlet gate valve, a powder inlet of the composite nozzle is connected with a powder supply system, control input of the movement mechanism, the heat spray system, the heat spray inlet gate valve, the cold spray system, the cold spray inlet gate valve and the powder supply system is connected with a control system, and opening or closing or movement is controlled by the control system. A workpiece is obtained on the surface of a substrate of the workbench, manufacturing is completed through hot spray and cold spray alternately, three-dimensional forming of the part can be achieved, residual stress is low, the structure is more compact, and the performance is better.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing technology, and in particular relates to a high density and low residual stress component additive manufacturing equipment and method. Background technique [0002] Thermal spraying and cold spraying are important surface engineering technologies, but the existing technologies have the following disadvantages: [0003] The density of the thermal sprayed coating is not high, and the temperature gradient existing in the thermal spraying process causes the coating to generate tensile thermal stress, and as the thickness of the coating increases, the accumulated residual tensile stress easily deforms and cracks the coating; [0004] The cold spray coating produces compressive stress due to severe plastic deformation. As the thickness of the coating increases, the accumulated residual compressive stress becomes larger, which easily deforms or even tears the coating; [0005] The thickness of ther...

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Problems solved by technology

[0003] The density of the thermal sprayed coating is not high, and the temperature gradient existing in the thermal spraying process causes the coating to generate tensile thermal stress, and as the thickness of the coating increases, the accumulated residual tensile stress easily deforms and cracks the coating;

[0004] The cold spray coating produces compressive stress due to severe plastic deformation. As the thickness of the coating increases, the accumulated residual compressive stress becomes larger, which easily deforms or even tears the coating;

[0005] The thickness of thermal spraying and cold spraying coatings is limited, and it is difficult to realize three-dimensional forming of parts

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